Here's a pretty good article explaining why you should probably stay away from some of the early, non-iPad, tablets.
http://www.pcmag.com/article2/0,2817,2379345,00.asp
That article is a hackjob. "Not sure if the OS will be upgradable"? WTF? All android devices have the ability for the OS to be upgraded OTA. Who cares if they came out a little too soon, before the "right" version of the OS came out. At least when that version does come out, BAM its on the tablet. And at least android tablet users wont have to wait like apple users. Tell me,... how many updates/upgrades have occured to iOS on the iPad since release?